Can someone help me do this

The correct answer would be shape of function b = 2× slope of function a.

So don't take my word i'm not exactly a mathematical person but i would assume a. because while selling the soap every month you increase in sells so you would by 11 percent. the you would get the factor 0.89 which if i had to guess would be the monthly profit over 11 probably wrong tho

You need to do x2-x1,y2-y1 and divide it by 2 and you should get (1,-3)